Have you ever tasted canned beans that have a 'tinny' tinge to their flavour? Ever had bottled water with a slightly pungent tang? An increasing number of health-conscious people are aware of what they eat. But are they as aware of what encases their food?

Foods are packed and stored using the most cost-effective methods available. Because of the way the mass-producing industries work, food needs to be kept for as long as possible. Unfortunately, this is not always in the best interests of the consumer's health.

Plastic

A product may be packed, stored and imported, after which it reaches its destination. There it may be left on the shelf for weeks, months or longer - a long time for your food and its wrapping to spend in each other's company. So what's the result of that much close contact?

Plastic is partly made from gaseous substances. During the solidification process some of these substances are trapped inside the plastic. With time, these gases slowly leach out into their surroundings. Therefore, the more time your food spends being hugged by its wrapping, the more these gases are likely to find their way into it.

Furthermore, acidic, fatty and hot foods have been found to increase the rate at which these gaseous substances leach. So think again before you stick leftovers from dinner in a plastic container for tomorrow.

Chemical disruption in the body

The link between plastic and breast cancer was first discovered in 1987, quite by accident. Research scientists Drs Ana Soto and Carlos Sonnenschein were carrying out experiments of cancer cell growth at Tufts Medical School in Boston, USA. During their experiments, endocrine-disrupting chemicals leached out from plastic test tubes, causing a startling proliferation of breast cancer cells.

A research team headed by David Feldman of the Stanford University School of Medicine, USA, had its experiments disrupted in a similar manner by the giant plastic jugs in its laboratory. These occurrences caused great interest and have resulted in further investigation.

Spanish researchers Fatima and Nicolas Olea tested metal food cans lined with plastic. Approximately half the cans tested were found to be leaching hormone-disrupting chemicals. The levels of contamination were 27 times more than the amount the Stanford team reported was enough to make breast cancer cells proliferate.

Concerns for children

Many plastics, including polycarbonates found in baby bottles and water jugs, have the ability to mimic natural oestrogen in the body. This becomes highly fat-soluble and non-biodegradable. It can accumulate in the fat tissue of animals and humans and is near impossible to excrete. Reduced sperm production, reproductive problems and growth difficulties are just some of the possible outcomes of exposure.

Certain additives that are not allowed in babyfood because they can adversely affect health. However, you'll find the very same additives on the surface of some plastic wraps. These substances can cause an increase in cholesterol levels and a breakdown of vitamin D in the body.

Aluminium

Aluminium makes up about eight per cent of the earth's crust. It's the third most common element and the most widely used metal after iron. It's used for the manufacture of aeroplanes, cars, boats and electrical equipment and in the construction industry. It's even used in rocket fuel.